There are two main advantages to under-desk keyboard trays. The first is the fact that they save space: the keyboard is not taking up any valuable desktop space, which is especially useful for smaller workstations. The other is that if your desk is a bit too high, the tray holds your keyboard slightly lower, which may make typing easier on your wrists and shoulders.
Keyboard tray mounting brackets:
Keyboard tray mounting brackets pictured: Fellowes Office Suites Underdesk Keyboard Drawer, Black/Silver (9140303)
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